/* -------------------------------------------------------------------------
 *
 * freebsd.h
 *	  port-specific prototypes for FreeBSD
 *
 * Portions Copyright (c) 1996-2012, PostgreSQL Global Development Group
 * Portions Copyright (c) 1994, Regents of the University of California
 *
 * src/backend/port/dynloader/freebsd.h
 *
 * -------------------------------------------------------------------------
 */
#ifndef PORT_PROTOS_H
#define PORT_PROTOS_H

#include <sys/types.h>
#include <nlist.h>
#include <link.h>
#include <dlfcn.h>

#include "utils/dynamic_loader.h" /* pgrminclude ignore */

/*
 * Dynamic Loader on NetBSD 1.0.
 *
 * this dynamic loader uses the system dynamic loading interface for shared
 * libraries (ie. dlopen/dlsym/dlclose). The user must specify a shared
 * library as the file to be dynamically loaded.
 *
 * agc - I know this is all a bit crufty, but it does work, is fairly
 * portable, and works (the stipulation that the d.l. function must
 * begin with an underscore is fairly tricky, and some versions of
 * NetBSD (like 1.0, and 1.0A pre June 1995) have no dlerror.)
 */

/*
 * In some older systems, the RTLD_NOW flag isn't defined and the mode
 * argument to dlopen must always be 1.  The RTLD_GLOBAL flag is wanted
 * if available, but it doesn't exist everywhere.
 * If it doesn't exist, set it to 0 so it has no effect.
 */
#ifndef RTLD_NOW
#define RTLD_NOW 1
#endif
#ifndef RTLD_GLOBAL
#define RTLD_GLOBAL 0
#endif

#define pg_dlopen(f) BSD44_derived_dlopen((f), RTLD_NOW | RTLD_GLOBAL)
#define pg_dlsym BSD44_derived_dlsym
#define pg_dlclose BSD44_derived_dlclose
#define pg_dlerror BSD44_derived_dlerror

char* BSD44_derived_dlerror(void);
void* BSD44_derived_dlopen(const char* filename, int num);
void* BSD44_derived_dlsym(void* handle, const char* name);
void BSD44_derived_dlclose(void* handle);

#endif /* PORT_PROTOS_H */
